I think the price is high for what you get, I bet this is a high profit margin item. It did make it super easy though to build up a one speed. The lockring is too small to really tighten over the outer spacer- I was not happy with that aspect of this kit. I modified it slightly to my satisfaction.
Would I buy this product again?- maybe.

Pros: It makes it easy and I only had to scrounge my spare parts a little.

Cons: I didn't like the way the lock ring fit on the spacers at all. I took a cog off an old cassette and used it between the last spacer and the lockring. Had I not done that I might have returned the kit. It's on a single speed- that cog is gonna be getting reefed on! I think they need a slight redesign on the spacer/lockring interface. The way I have it set up it works great.

I bought the kit without the cog. This also meant that I didn't get the lockring. You need a 12t lockring to fit these spacers. The picture shows what appears to be 2- 3mm and 6- 1mm spacers. I think mine came with 6- 2mm and 2- .5mm spacers. I have had some issues getting my cog to be centered while getting the correct amount of spacers to fit the lockring. The spacers are also a bit larger than my freehub which means it takes some massaging to line up perfectly.

This product was meant for the conversion from geared hub to single speed. This is the first brand I have tried, but I feel they left out a part. While I am pleased with the actual quality of the product, I don't feel the value was great because I still need to buy an additional part to make this work. I assumed because it was a conversion kit, it would have everything I'd need. However, I still need to buy the cassette lock ring to hold everything on the wheel's hub. A little disappointed that didn't have everything I needed, but I think that was my fault. I need to do better research next time.

Cons: Needs one additional part to make it work so it isn't the complete kit. Make sure to order a lock ring with it if you buy it.

I picked up the spacers-only kit for Shimano freehubs, and it works fine. The finish isn't as nice and the chainline is a bit less adjustable than with the Fibonacci kit, but it's less than half the cost and probably flexible enough to get the chainline within a millimeter of perfect for most applications.

The cog that came with my Shimano kit did not look like the picture. In fact, it was just a thin piece of metal that I wouldn't ever trust on my bike. That said, I bought it knowing I wouldn't use the cog.

This is a mixed bag with this SS conversion kit. On the positive, I like the different thickness of the many spacers. Easy to line up the cog with your chainline, On the not so positive, there was a looseness in the way the adapters feel on the freehub, and I did not like the thin cog. Having said that, this did work, and for the money it is less expensive than other setups or Surly stainless cogs, but in my opinion, I would look at other conversion kits

I bought the spacers only kit for Shimano compatible hubs. I bought this kit because it has thin 1mm spacers for fine chainline adjustment (that some other kits don't include at all) and it has a lot of them. The plethora of thin spacers have also come in handy for setting up "dinglespeeds" and custom cassettes

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